//
// However, we switch to the systemstack to record the lock held to ensure that
// we record an accurate lock ordering. e.g., without systemstack, a stack
// split on entry to lock2() would record stack split locks as taken after l,
// even though l is not actually locked yet.
func lockWithRank(l *mutex, rank lockRank) {
	if l == &debuglock || l == &paniclk || l == &raceFiniLock {
		// debuglock is only used for println/printlock(). Don't do lock

			}
			sp.files[fname] = file
		}
		callees := frames[:i]
		stack := make([]callID, 0, len(callees))
		for j := len(callees) - 1; j >= 0; j-- { // Reverse so caller is first
			stack = append(stack, callID{
				file: callees[j].File,
				line: callees[j].Line,
			})
		}
		file.lines[f.Line] = append(file.lines[f.Line], sourceInst{addr, stack})

		// Remember the first function name encountered per source line

	re(`-f(no-)?omit-frame-pointer`),
	re(`-f(no-)?openmp(-simd)?`),
	re(`-f(no-)?permissive`),
	re(`-f(no-)?(pic|PIC|pie|PIE)`),
	re(`-f(no-)?plt`),
	re(`-f(no-)?rtti`),
	re(`-f(no-)?split-stack`),
	re(`-f(no-)?stack-(.+)`),
	re(`-f(no-)?strict-aliasing`),
	re(`-f(un)signed-char`),
	re(`-f(no-)?use-linker-plugin`), // safe if -B is not used; we don't permit -B
	re(`-f(no-)?visibility-inlines-hidden`),
	re(`-fsanitize=(.+)`),

// SetMaxStack sets the maximum amount of memory that
// can be used by a single goroutine stack.
// If any goroutine exceeds this limit while growing its stack,
// the program crashes.
// SetMaxStack returns the previous setting.
// The initial setting is 1 GB on 64-bit systems, 250 MB on 32-bit systems.
// There may be a system-imposed maximum stack limit regardless
// of the value provided to SetMaxStack.
//

		if v == "2" {
			// Obtain the caller stack. (This is equivalent to runtime/debug.Stack,
			// copied to avoid importing the whole package.)
			stack := make([]byte, 1024)
			for {
				n := runtime.Stack(stack, false)
				if n < len(stack) {
					stack = stack[:n]
					break
				}
				stack = make([]byte, 2*len(stack))
			}

			if i := bytes.Index(stack, []byte("\nos/exec.Command(")); i >= 0 {

	node  parse.Node // current node, for errors
	vars  []variable // push-down stack of variable values.
	depth int        // the height of the stack of executing templates.
}

// variable holds the dynamic value of a variable such as $, $x etc.
type variable struct {
	name  string
	value reflect.Value
}

// push pushes a new variable on the stack.
func (s *state) push(name string, value reflect.Value) {

				}
			}

			// The goroutine hasn't been identified yet. Take the transition stack
			// and identify the goroutine by the root frame of that stack.
			// This root frame will be identical for all transitions on this
			// goroutine, because it represents its immutable start point.
			if g.Name == "" {
				stk := st.Stack
				if stk != NoStack {
					var frame StackFrame
					var ok bool

			// useful since there's no way to re-run them deterministically.
			f.testContext.match.clearSubNames()
		}

		// Record the stack trace at the point of this call so that if the subtest
		// function - which runs in a separate stack - is marked as a helper, we can
		// continue walking the stack into the parent test.
		var pc [maxStackLen]uintptr
		n := runtime.Callers(2, pc[:])
		t := &T{
			common: common{

	methods  map[*TypeName][]*Func    // maps package scope type names to associated non-blank (non-interface) methods
	untyped  map[syntax.Expr]exprInfo // map of expressions without final type
	delayed  []action                 // stack of delayed action segments; segments are processed in FIFO order
	objPath  []Object                 // path of object dependencies during type inference (for cycle reporting)

			*graph.NodeInfo
			inline bool
		}
		var stack []stk
		for _, loc := range sample.Location {
			nodes := locations[loc.ID]
			for i, n := range nodes {
				// The inline flag may be inaccurate if 'show' or 'hide' filter is
				// used. See https://github.com/google/pprof/issues/511.
				inline := i != len(nodes)-1
				stack = append(stack, stk{&n.Info, inline})
			}
		}

		if len(stack) == 0 {